CN115071944A - Diesel engine vibration damping base based on acoustic black hole nonlinear contact - Google Patents
Diesel engine vibration damping base based on acoustic black hole nonlinear contact Download PDFInfo
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- CN115071944A CN115071944A CN202210672571.4A CN202210672571A CN115071944A CN 115071944 A CN115071944 A CN 115071944A CN 202210672571 A CN202210672571 A CN 202210672571A CN 115071944 A CN115071944 A CN 115071944A
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- 238000013016 damping Methods 0.000 title claims abstract description 37
- 230000009467 reduction Effects 0.000 claims abstract description 14
- 239000011248 coating agent Substances 0.000 claims description 13
- 238000000576 coating method Methods 0.000 claims description 13
- 239000010426 asphalt Substances 0.000 claims description 4
- 229920000642 polymer Polymers 0.000 claims description 4
- 230000007246 mechanism Effects 0.000 claims description 2
- 229910052731 fluorine Inorganic materials 0.000 claims 2
- 125000001153 fluoro group Chemical group F* 0.000 claims 2
- 230000000694 effects Effects 0.000 abstract description 10
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000002730 additional effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H21/00—Use of propulsion power plant or units on vessels
- B63H21/30—Mounting of propulsion plant or unit, e.g. for anti-vibration purposes
- B63H21/305—Mounting of propulsion plant or unit, e.g. for anti-vibration purposes with passive vibration damping
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/162—Selection of materials
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
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- Ocean & Marine Engineering (AREA)
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- Acoustics & Sound (AREA)
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Abstract
The invention discloses a diesel engine vibration damping base based on acoustic black hole nonlinear contact, which comprises a base top plate, a base bottom plate, a bearing beam and an acoustic black hole structure, wherein the base top plate is provided with a plurality of through holes; the bearing beam is arranged between the base top plate and the base bottom plate; at least one bearing beam is arranged between the base top plate and the base bottom plate; at least one bearing beam is connected with an acoustic black hole structure, and the acoustic black hole structure is respectively parallel to the base top plate and the base bottom plate; a conical contact structure is arranged on the base bottom plate and is arranged below the acoustic black hole structure; the conical contact structure and the acoustic black hole are in nonlinear contact. According to the invention, the bearing beam is provided with the acoustic black hole structure, so that vibration generated during the operation of the diesel engine is transferred to the acoustic black hole structure for damping; the acoustic black hole structure is in nonlinear contact with the conical contact structure, low-frequency energy on the acoustic black hole structure is converted into high-frequency energy, the frequency of the original vibration wave is changed, and the vibration reduction speed and effect are improved.
Description
Technical Field
The invention belongs to the technical field of diesel engine base damping devices, and particularly relates to a diesel engine damping base based on acoustic black hole nonlinear contact.
Background
The diesel engine is used as main power equipment of the ship, and complex vibration interference is often generated on the ship in the working process, so that the safety, the stability and the mechanical performance of the ship are affected, and physical discomfort of ship personnel is easily caused. The acoustic black hole is a sound wave control technology with simple structure and high vibration reduction efficiency, and can realize energy gathering through certain cutting according to the structural thickness design, so that damping materials are pasted in a vibration energy gathering area to realize low-cost and high-efficiency sound energy consumption. However, the acoustic black hole has a cut-off frequency below which the damping effect of the acoustic black hole is lost.
In chinese patent publication (application No. 202010635526.2, application publication No. CN 113879459 a), a composite wave-damping base for ship based on acoustic black hole effect comprises: a base panel; a base floor; a base web positioned between the base deck and the base floor; a base toggle configured to be simultaneously perpendicular to the base deck, the base floor, and the base web; the base web and/or the base toggle plate are/is provided with a plurality of acoustic black hole structures which are arranged in at least three straight lines, and the acoustic black hole structures on any two adjacent straight lines are periodically arranged in different arrangement rules.
Referring to the above-mentioned published chinese patent, a ship hull composite wave-blocking base based on the acoustic black hole effect still has the following disadvantages: only through the black hole structure of acoustics, can not effectively realize the damping function, only can be to playing the additional action for the damping effect is not good.
Disclosure of Invention
Aiming at the defects, the invention provides the vibration reduction base of the diesel engine based on the acoustic black hole nonlinear contact, which has the advantages of simple structure, convenience in use and good vibration reduction effect.
The invention aims to realize the following steps: a vibration reduction base of a diesel engine based on acoustic black hole nonlinear contact is connected with the diesel engine through a connecting mechanism; the vibration damping base is characterized by comprising a base top plate, a base bottom plate, a bearing beam and an acoustic black hole structure; the bearing beam is arranged between the top plate and the bottom plate of the base;
at least one bearing beam is arranged between the base top plate and the base bottom plate;
an acoustic black hole structure is constructed on at least one bearing beam, and the acoustic black hole structure is respectively parallel to the base top plate and the base bottom plate;
the base bottom plate is provided with a conical contact structure, and the conical contact structure is arranged below the acoustic black hole structure; the conical contact structure is contacted with the acoustic black hole structure when colliding.
Preferably, the acoustic black hole structure comprises an acoustic black hole beam and an acoustic black hole wedge surface, and the acoustic black hole beam is of a square structure; one end of the acoustic black hole beam is connected with the bearing beam, and the other end of the acoustic black hole beam is connected with the acoustic black hole wedge surface.
Preferably, the conical contact structure is arranged below the acoustic black hole beam; the conical contact structure is in contact with the acoustic black hole beam when colliding; let x 0 The distance from the conical collision structure to the joint of the acoustic black hole beam and the bearing beam; x is the number of 1 Is the length of the acoustic black hole beam; the specific position of the cone-shaped collision structure satisfies x 0 ＜x 1 。
Preferably, the relationship between the acoustic black hole beam and the acoustic black hole wedge surface is as follows:
wherein,
h 0 the thickness of the tail end of the acoustic black hole wedge surface; h is 1 The front end thickness of the acoustic black hole wedge surface; x is the number of 1 Is the length of the acoustic black hole beam; x is the number of 2 The total length of the acoustic black hole structure.
Preferably, the ship shell is connected below the base bottom plate, and the base bottom plate is fixedly connected with the ship shell.
Preferably, the damping coating is made of high molecular polymer or asphalt.
The thickness of the damping coating is 0.8-1.5 times of the minimum value of the thickness of the wedge surface of the acoustic black hole.
Preferably, a concave space is arranged on the acoustic black hole beam. And a concave space is arranged on the acoustic black hole beam to reduce the weight of the acoustic black hole beam so as to enlarge the range of nonlinear contact generated by structural vibration and improve the vibration reduction effect.
Preferably, the vibration damping base comprises a base top plate and a base bottom plate, 5 bearing beams are uniformly constructed between the base top plate and the base bottom plate, and 3 acoustic black hole structures are uniformly constructed on 4 bearing beams which are sequentially arranged; a conical contact structure is arranged on the base bottom plate and is arranged below the acoustic black hole structure; conical contact structures are arranged below the acoustic black hole structures; the conical contact structure is contacted with the acoustic black hole structure when colliding.
The invention has the beneficial effects that: 1. the bearing beam is provided with the acoustic black hole structure, so that vibration generated when the diesel engine works is transferred to the acoustic black hole structure for damping; meanwhile, a conical contact structure is connected below the acoustic black hole structure, the acoustic black hole structure is in nonlinear contact with the conical contact structure, low-frequency energy on the acoustic black hole structure is converted into high-frequency energy, the frequency of the original vibration wave is changed, the vibration reduction speed and effect are improved, and noise reduction is completed.
2. The concave space is arranged on the upper end face of the acoustic black hole beam, so that the change of the vibration wave is changed to realize the wave collection; meanwhile, energy can be gathered through the acoustic black hole wedge surface, the gathered high-frequency energy is consumed through the damping coating arranged on the acoustic black hole wedge surface, the energy attenuation effect is further accelerated, and the overall vibration reduction performance is effectively improved.
Drawings
Fig. 1 is an overall structural view of the present invention.
Fig. 2 is a partial structural schematic diagram of the present invention.
Fig. 3 is a partial structural schematic diagram of the present invention.
Fig. 4 is a front view of the present invention.
Fig. 5 is an enlarged view at a.
FIG. 6 is a diagram illustrating acoustic black hole parameters.
The marine engine comprises a diesel engine 1, a base top plate 2, a bearing beam 3, a base bottom plate 4, an acoustic black hole beam 5, an acoustic black hole wedge surface 6, a marine shell 7 and a conical contact structure 8.
Detailed Description
The invention will be further described below with reference to the accompanying drawings.
As shown in fig. 1, 2 and 3, a vibration damping base of a diesel engine 1 based on acoustic black hole nonlinear contact comprises a base top plate 2, a base bottom plate 4, a bearing beam 3 and an acoustic black hole structure; the bearing beam 3 is arranged between the base top plate 2 and the base bottom plate 4, and two ends of the bearing beam 3 are respectively and vertically connected with the base top plate 2 and the base bottom plate 4; a plurality of bearing beams 3 are uniformly arranged between the base top plate 2 and the base bottom plate 4; the acoustic black hole structure comprises an acoustic black hole beam 5 and an acoustic black hole wedge surface 6, wherein one end of the acoustic black hole beam 5 is connected with the bearing beam 3, and the other end of the acoustic black hole beam is connected with the acoustic black hole wedge surface 6; the acoustic black hole beam 5 is vertically connected to the bearing beam 3, and the acoustic black hole beam 5 is parallel to the base top plate 2 and the base bottom plate 4; a plurality of acoustic black hole beams 5 are uniformly arranged on the bearing beam 3.
Further, as shown in fig. 6, the other end of the acoustic black hole beam 5 is connected to the acoustic black hole wedge surface 6, and the main parameter relationship between the acoustic black hole beam 5 and the acoustic black hole wedge surface 6 is as follows:
wherein,
h 0 the thickness of the tail end of the acoustic black hole wedge surface 6; h is 1 The front end thickness of the acoustic black hole wedge surface 6; x is the number of 1 Is the length of the acoustic black hole beam 5; x is the number of 2 The total length of the acoustic black hole structure.
Further, as shown in fig. 4, the base bottom plate 4 is provided with a tapered contact structure8, the conical contact structure 8 is arranged below the acoustic black hole beam 5 and is in nonlinear connection with the acoustic black hole beam 5; let x 0 The distance from the conical collision structure to the joint of the acoustic black hole beam 5 and the bearing beam 3; x is the number of 1 Is the length of the acoustic black hole beam 5; the specific position of the cone-shaped collision structure satisfies x 0 ＜x 1 Every time the acoustic black hole beam 5 contacts the conical collision structure, a certain amount of energy is sputtered from a low-frequency region to a high-frequency region, so that the energy of the system is redistributed in a frequency domain.
Further, as shown in fig. 5, a concave space is provided on the acoustic black hole beam 5, so as to reduce the weight of the acoustic black hole beam 5, thereby increasing the range of nonlinear contact generated by structural vibration; the upper surface of the acoustic black hole wedge surface 6 is provided with a damping coating, and the damping coating can be made of high molecular polymer or asphalt; the thickness of the damping coating is 0.8-1.5 times of the minimum value of the thickness of the acoustic black hole wedge surface 6.
Example (b):
the overall dimension of the base of the diesel engine 1 is selected to be 0.5m in length, 0.4m in width and 0.05m in height, and the dimension x of the acoustic black hole structure 0 ＝0.025m，h 1 ＝0.003m，x 2 ＝0.04m。
As shown in fig. 1 and 2, the vibration reduction base of the whole diesel engine 1 adopts 2 base top plates 2 and 1 base bottom plate 4, the 2 base top plates 2 are respectively connected with two sides of the base bottom plate 4 through bearing beams 3, 5 bearing beams 3 are evenly arranged between the base top plate 2 and the base bottom plate 4, 3 acoustic black hole structures are evenly arranged on the front 4 bearing beams 3 which are sequentially arranged from left to right, and a conical contact structure 8 is nonlinearly connected below each acoustic black hole structure.
As shown in fig. 3, the base bottom plate 4 is fixedly connected to the ship shell 7, and the diesel engine 1 is connected to the base top plate 2 through bolts, so that the detachable connection is realized.
As shown in fig. 4 and 5, the acoustic black hole structure includes an acoustic black hole beam 5 and an acoustic black hole wedge surface 6, one end of the acoustic black hole beam 5 is connected to the bearing beam 3, and the other end is connected to the acoustic black hole wedge surface 6; the acoustic black hole beam 5 is vertically connected to the bearing beam 3, and the acoustic black hole beam 5 is parallel to the base top plate 2 and the base bottom plate 4; the other end of the acoustic black hole beam 5 is connected with the acoustic black hole wedge surface 6, the main parameter relation between the acoustic black hole beam 5 and the acoustic black hole wedge surface 6 is expressed by adopting the product of an exponential function and a power function, and the main parameter relation is as follows:
wherein,
h 0 the thickness of the tail end of the acoustic black hole wedge surface 6; h is 1 The front end thickness of the acoustic black hole wedge surface 6; x is the number of 1 Is the length of the acoustic black hole beam 5; x is the number of 2 The total length of the acoustic black hole structure. A cone-shaped collision structure is arranged below the acoustic black hole beam 5, the bottom surface of the cone-shaped collision structure is connected to the base bottom plate 4, and x is arranged 0 The distance from the conical collision structure to the joint of the acoustic black hole beam 5 and the bearing beam 3; x is the number of 1 Is the length of the acoustic black hole beam 5; the specific position of the cone-shaped collision structure satisfies x 0 ＜x 1 Every time the acoustic black hole beam 5 contacts the conical collision structure, a certain amount of energy is sputtered from a low-frequency region to a high-frequency region, so that the energy of the system is redistributed in a frequency domain.
The upper surface of the acoustic black hole wedge surface 6 is provided with a damping coating, the damping coating is made of high polymer or asphalt, and the thickness of the damping coating is 0.8-1.5 times of the minimum value of the thickness of the acoustic black hole wedge surface 6.
The working principle is as follows: the diesel engine 1 is as the main power equipment of boats and ships, and the diesel engine 1 produces complicated vibration during operation and uses on base roof plate 2, and base roof plate 2 transmits the vibration energy for acoustics black hole roof beam 5 through spandrel girder 3, and acoustics black hole roof beam 5 contacts with the toper collision structure on the base bottom 8 in the vibration process and produces the collision, with the help of the nonlinear principle of contact, converts low frequency energy into high frequency energy. Meanwhile, based on the energy accumulation effect of the acoustic black hole wedge surface 6, the damping coating consumes the high-frequency energy accumulated on the black hole wedge surface, so that the vibration isolation and noise reduction of the base are completed in the working process of the diesel engine 1.
The above description is only an embodiment of the present invention, and is not intended to limit the present invention. Various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, improvement or the like made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (10)
1. A vibration reduction base of a diesel engine (1) based on acoustic black hole nonlinear contact is connected with the diesel engine (1) through a connecting mechanism; the vibration reduction base is characterized by comprising a base top plate (2), a base bottom plate (4), a bearing beam (3) and an acoustic black hole structure;
the bearing beam (3) is arranged between the base top plate (2) and the base bottom plate (4);
at least one bearing beam (3) is arranged between the base top plate (2) and the base bottom plate (4);
an acoustic black hole structure is constructed on at least one bearing beam (3), and the acoustic black hole structure is respectively parallel to the base top plate (2) and the base bottom plate (4);
a conical contact structure (8) is arranged on the base bottom plate (4), and the conical contact structure (8) is arranged below the acoustic black hole structure; the conical contact structure (8) is contacted with the acoustic black hole structure when colliding.
2. The diesel engine vibration damping base based on the acoustic black hole nonlinear contact is characterized in that: the acoustic black hole structure comprises an acoustic black hole beam (5) and an acoustic black hole wedge surface (6), and the acoustic black hole beam (5) is of a square structure; one end of the acoustic black hole beam (5) is connected with the bearing beam (3), and the other end of the acoustic black hole beam is connected with the acoustic black hole wedge surface (6).
3. The diesel engine vibration damping base based on the acoustic black hole nonlinear contact is characterized in that: the conical contact structure (8) is arranged below the acoustic black hole beam (5); the conical contact structure (8) is in contact with the acoustic black hole beam (5) when colliding; let x 0 Is in conical collisionThe distance from the structure to the joint of the acoustic black hole beam (5) and the bearing beam (3); x is the number of 1 Is the length of the acoustic black hole beam (5); the specific position of the cone-shaped collision structure satisfies x 0 ＜x 1 。
4. The diesel engine vibration damping base based on the acoustic black hole nonlinear contact is characterized in that: and a damping coating is arranged on the upper surface of the acoustic black hole wedge surface (6).
5. The diesel engine vibration damping base based on the acoustic black hole nonlinear contact is characterized in that: and a concave space is arranged on the acoustic black hole beam (5).
6. The diesel engine vibration damping base based on the acoustic black hole nonlinear contact is characterized in that: the relationship between the acoustic black hole beam (5) and the acoustic black hole wedge surface (6) is as follows:
wherein,
h 0 the tail end thickness of the acoustic black hole wedge surface (6); h is 1 The front end thickness of the acoustic black hole wedge surface (6); x is a radical of a fluorine atom 1 Is the length of the acoustic black hole beam (5); x is a radical of a fluorine atom 2 The total length of the acoustic black hole structure.
7. The diesel engine vibration damping base based on the acoustic black hole nonlinear contact is characterized in that: the ship shell (7) is connected below the base bottom plate (4), and the base bottom plate (4) is fixedly connected with the ship shell (7).
8. The vibration damping base for the diesel engine based on the acoustic black hole nonlinear contact is characterized in that: the damping coating is made of high molecular polymer or asphalt.
9. The vibration damping base for the diesel engine based on the acoustic black hole nonlinear contact is characterized in that: the thickness of the damping coating is 0.8-1.5 times of the minimum value of the thickness of the acoustic black hole wedge surface (6).
10. The acoustic black hole non-linear contact diesel engine vibration damping mount as set forth in any one of claims 1-9, wherein: the vibration reduction base comprises a base top plate (2) and a base bottom plate (4), 5 bearing beams (3) are uniformly constructed between the base top plate (2) and the base bottom plate (4), and 3 acoustic black hole structures are uniformly constructed on the 4 bearing beams (3) which are sequentially arranged.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210672571.4A CN115071944A (en) | 2022-06-14 | 2022-06-14 | Diesel engine vibration damping base based on acoustic black hole nonlinear contact |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210672571.4A CN115071944A (en) | 2022-06-14 | 2022-06-14 | Diesel engine vibration damping base based on acoustic black hole nonlinear contact |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205602082U (en) * | 2016-03-31 | 2016-09-28 | 福建省马尾造船股份有限公司 | Marine shock attenuation base |
| CN107606027A (en) * | 2017-08-21 | 2018-01-19 | 哈尔滨工程大学 | A kind of two-freedom collides non-linear vibration damping device |
| CN108717850A (en) * | 2018-04-28 | 2018-10-30 | 南京航空航天大学 | A kind of doubling plate chamber vibration and noise reducing structure |
| WO2019148891A1 (en) * | 2018-01-30 | 2019-08-08 | 香港理工大学 | Wideband vibration suppression device utilizing properties of sonic black hole |
| KR20200119985A (en) * | 2019-04-11 | 2020-10-21 | 한국과학기술원 | Acoustic black hole beam structure with converging width and thickness |
| CN212473812U (en) * | 2020-07-03 | 2021-02-05 | 中国船舶重工集团公司第七一一研究所 | Hull composite wave-blocking base based on acoustic black hole effect |
| CN113280072A (en) * | 2021-05-17 | 2021-08-20 | 安徽工程大学 | Automobile chassis vibration and noise reduction device based on acoustic black hole effect |
-
2022
- 2022-06-14 CN CN202210672571.4A patent/CN115071944A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205602082U (en) * | 2016-03-31 | 2016-09-28 | 福建省马尾造船股份有限公司 | Marine shock attenuation base |
| CN107606027A (en) * | 2017-08-21 | 2018-01-19 | 哈尔滨工程大学 | A kind of two-freedom collides non-linear vibration damping device |
| WO2019148891A1 (en) * | 2018-01-30 | 2019-08-08 | 香港理工大学 | Wideband vibration suppression device utilizing properties of sonic black hole |
| CN108717850A (en) * | 2018-04-28 | 2018-10-30 | 南京航空航天大学 | A kind of doubling plate chamber vibration and noise reducing structure |
| KR20200119985A (en) * | 2019-04-11 | 2020-10-21 | 한국과학기술원 | Acoustic black hole beam structure with converging width and thickness |
| CN212473812U (en) * | 2020-07-03 | 2021-02-05 | 中国船舶重工集团公司第七一一研究所 | Hull composite wave-blocking base based on acoustic black hole effect |
| CN113280072A (en) * | 2021-05-17 | 2021-08-20 | 安徽工程大学 | Automobile chassis vibration and noise reduction device based on acoustic black hole effect |
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